<?php 
  $v1 = 7&9; 
  echo "<br>",$v1;
  $v2 =7|9;
  echo "<br>",$v2;
  $v3 = 8<<2;  //按为左移运算
  echo "<br>",$v3;

//   将以个整数左移n位，就是相当与将该数*2的n次方
?>